Richards, J. A. ; Royer, J. R. ; Liebchen, B. ; Guy, B. M. ; Poon, W. C. K. (2019)
Competing Timescales Lead to Oscillations in Shear-Thickening Suspensions.
In: Phys. Rev. Lett., 123
doi: 10.1103/PhysRevLett.123.038004
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Competing timescales generate novelty. Here, we show that a coupling between the timescales imposed by instrument inertia and the formation of interparticle frictional contacts in shear-thickening suspensions leads to highly asymmetric shear-rate oscillations. Experiments tuning the presence of oscillations by varying the two timescales support our model. The observed oscillations give access to a shear-jamming portion of the flow curve that is forbidden in conventional rheometry. Moreover, the oscillation frequency allows us to quantify an intrinsic relaxation time for particle contacts. The coupling of fast contact network dynamics to a slower system variable should be generic to many other areas of dense suspension flow, with instrument inertia providing a paradigmatic example.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Richards, J. A. ; Royer, J. R. ; Liebchen, B. ; Guy, B. M. ; Poon, W. C. K. |
| Art des Eintrags: | Bibliographie |
| Titel: | Competing Timescales Lead to Oscillations in Shear-Thickening Suspensions |
| Sprache: | Englisch |
| Publikationsjahr: | 19 Juli 2019 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Phys. Rev. Lett. |
| Jahrgang/Volume einer Zeitschrift: | 123 |
| DOI: | 10.1103/PhysRevLett.123.038004 |
| Kurzbeschreibung (Abstract): | Competing timescales generate novelty. Here, we show that a coupling between the timescales imposed by instrument inertia and the formation of interparticle frictional contacts in shear-thickening suspensions leads to highly asymmetric shear-rate oscillations. Experiments tuning the presence of oscillations by varying the two timescales support our model. The observed oscillations give access to a shear-jamming portion of the flow curve that is forbidden in conventional rheometry. Moreover, the oscillation frequency allows us to quantify an intrinsic relaxation time for particle contacts. The coupling of fast contact network dynamics to a slower system variable should be generic to many other areas of dense suspension flow, with instrument inertia providing a paradigmatic example. |
| Freie Schlagworte: | publiziert |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) |
| Hinterlegungsdatum: | 09 Aug 2019 07:50 |
| Letzte Änderung: | 19 Aug 2020 10:31 |
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